package wp.ggt.com.wpview.view;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

/**
 * Created by KF on 2016/3/18.
 */
public class MyViewGroup extends ViewGroup implements View.OnClickListener {
    private static final int PADDING_HOR = 10;//水平方向padding
    private static final int PADDING_VERTICAL = 5;//垂直方向padding
    private static final int SIDE_MARGIN = 10;//左右间距
    private static final int TEXT_MARGIN = 10;


    private ItemClickListener itemClickListener;

    public interface ItemClickListener {
        void onItemClickListener(View view, int position);
    }

    public void setItemClickListener(ItemClickListener itemClickListener) {
        this.itemClickListener = itemClickListener;
    }

    public MyViewGroup(Context context) {
        super(context);
    }

    public MyViewGroup(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public MyViewGroup(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        int childCount = getChildCount();
        int autualWidth = r - l;
        int x = 0;// 横坐标开始
        int y;//纵坐标开始
        int rows = 1;
        for (int i = 0; i < childCount; i++) {
            View view = getChildAt(i);
            view.setOnClickListener(this);
            view.setTag(i);
            int width;
            int height;
            if (view.getLayoutParams() != null) {
                width = view.getLayoutParams().width;
                height = view.getLayoutParams().height;
            } else {
                width = view.getMeasuredWidth();
                height = view.getMeasuredHeight();
            }
            x += width + TEXT_MARGIN;
            if (x > autualWidth) {
                x = width + SIDE_MARGIN;
                rows++;
            }
            y = rows * (height + TEXT_MARGIN);
            if (i == 0)
                view.layout(x - width - SIDE_MARGIN, y - height, x, y);
            view.layout(x - width, y - height, x, y);
        }

    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int x = 0;//横坐标
        int y = 0;//纵坐标
        int rows = 1;//总行数
        int specWidth = MeasureSpec.getSize(widthMeasureSpec);
        int actualWidth = specWidth - SIDE_MARGIN * 2;//实际宽度
        int childCount = getChildCount();
        for (int index = 0; index < childCount; index++) {
            View child = getChildAt(index);
            child.setPadding(PADDING_HOR, PADDING_VERTICAL, PADDING_HOR, PADDING_VERTICAL);
            child.measure(MeasureSpec.EXACTLY, MeasureSpec.EXACTLY);
            int width;
            int height;
            if (child.getLayoutParams() != null) {
                width = child.getLayoutParams().width;
                height = child.getLayoutParams().height;
            } else {
                width = child.getMeasuredWidth();
                height = child.getMeasuredHeight();
            }
            x += width + TEXT_MARGIN;
            if (x > actualWidth) {//换行
                x = width;
                rows++;
            }
            y = rows * (height + TEXT_MARGIN);
        }
        setMeasuredDimension(actualWidth, y);
    }

    @Override
    public void onClick(View v) {
        if (itemClickListener != null) {
            itemClickListener.onItemClickListener(v, (int) v.getTag());
        }
    }
}

